Mason BB Pinblock Located

After the pinblock is fit to the plate, it must be located in the body of the piano to the proper location and height. I prefer to have my blocks fit tight on the sides and the front to the stretcher. This requires careful indexing and some trial and error. The plate must be returned to it's proper height and location side to side and back to back. Also the pinblock must lay flat on the shelf where it is mounted. When all these requirements are met, the block is dry fit with screws for the next step of setting the bearing.

Two Pinblocks Fit To Plate

Two pinblocks in one day isn't a bad days work! I spend more time fitting the block to the plate than most. I feel it is important to have a good fit not only on the flange, but also to the web of the plate. I fit the block to the web much like I fit the block to the flange. The web area is masked, and paint is applied to the web and the flange. A power sander is used to remove the high spots (dark areas) until the desired fit is achieved. I finish the flange fit with automotive polyester body filler for a perfect flange fit.

Bridge Cap Glue Up

One half inch thick quarter sawn hard rock maple is the material used for bridge caps. Because the cap and the bridge body are made from a very hard wood, it is very important that the joining surfaces mate perfectly. I use a combination of thickness planer, joiner, sanding block and scraper to achieve this perfect mating. It is a bit tedious, but it is possible. Once this is accomplished, the cap and body are joined with a special glue (Bolduc acoustic wood glue) and clamped with about 200 psi pressure. After drying overnight, the over hanging wood stock is removed with a spiral trimming router bit in my router table. The result is a tight joint, and nicely planed side, and a bridge that is ready to be planed to the proper height when setting the bearing.

Bridge Work

Today was bridge work day. No, I wasn't at the dentist. I was beginning the process of installing new caps to two piano's bridges. The old bridge pins have been removed, and a pattern is made to recreate the old bridge pin lay out after the new cap is glued to the bridge body. Thin Lexan is used as a pattern material. It is placed on top of the old bridge cap and indexing holes are drilled through the Lexan and through the bridge cap and bridge body. The blank patterns are attached to the old bridges with bridge pins. An awl is then used to mark the locations on all the empty bridge pin holes. The patterns are completed by drilling a hole through the pattern at every bridge pin location. After the patterns are completed, and the thickness of the original bridges are recorded, the old caps are removed with the bandsaw. The old bridge pin holes are plugged with small dowels and glue. After the glue has sufficient time to dry, the bridge body will be planed to receive the new caps.

Mason & Hamlin BB Board Pressed

In less than a week I have pressed two sound boards, the latest being the Mason and Hamlin BB. Above is a pic of the old beside the new. At this time i have three pressed boards in my hot box. It seems things come in waves. The second pic is inside my hot box.

Baldwin F Soundboard Pressed

Today the Baldwin F board was pressed. The panel had been maintained at 5.0 % EMC for several weeks now, and all the prep work was completed. The ribs were glues with Bolduc supplied glue, at 100 PSI. It was in the press for 6 hours. Now back into the hot box. It will remain there through all the bridge work and final fitting. Only after the board is glued into the piano will be allowed to return to normal atmospheric conditions.

Baldwin F Ribs Indexed

After the ribs are properly fit to the rim reliefs, and the new soundboard panel is fit to the rim, I am ready to index the ribs to the new panel. A hole is drilled through all the rib tips into the rim. Following that, a #7 bridge pin is installed in all the ribs and the 3 original indexing holes drilled before the old board was removed. The fit new panel is then placed on top, and the protruding bridge pins are press into the panel, leaving indentations. Using these indentations, the old board is laid on top of the new panel, and aligned to the 3 indexing pins. All the holes are transferred from the old board to the new panel. The indexed new ribs are then placed on the new panel, and traced. These holes will be used to locate the ribs when the board is pressed.